Detection of the integrated Sachs-Wolfe effect and corresponding dark energy constraints made with directional spherical wavelets

Using a directional spherical wavelet analysis we detect the integrated Sachs-Wolfe (ISW) effect, indicated by a positive correlation between the first-year Wilkinson Microwave Anisotropy Probe (WMAP) and NRAO VLA Sky Survey (NVSS) data. Detections are made using both a directional extension of the...

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Autores: McEwen, J. D., Vielva, Patricio, Hobson, M. P., Martínez-González, Enrique, Lasenby, Anthony N.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2007
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/386148
Acceso en línea:http://hdl.handle.net/10261/386148
Access Level:acceso abierto
Palabra clave:Methods: data analysis
Cosmic microwave background
Cosmology: observations
Methods: numerical
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spelling Detection of the integrated Sachs-Wolfe effect and corresponding dark energy constraints made with directional spherical waveletsMcEwen, J. D.Vielva, PatricioHobson, M. P.Martínez-González, EnriqueLasenby, Anthony N.Methods: data analysisCosmic microwave backgroundCosmology: observationsMethods: numericalUsing a directional spherical wavelet analysis we detect the integrated Sachs-Wolfe (ISW) effect, indicated by a positive correlation between the first-year Wilkinson Microwave Anisotropy Probe (WMAP) and NRAO VLA Sky Survey (NVSS) data. Detections are made using both a directional extension of the spherical Mexican hat wavelet and the spherical butterfly wavelet. We examine the possibility of foreground contamination and systematics in the WMAP data and conclude that these factors are not responsible for the signal that we detect. The wavelet analysis inherently enables us to localize on the sky those regions that contribute most strongly to the correlation. On removing these localized regions the correlation that we detect is reduced in significance, as expected, but it is not eliminated, suggesting that these regions are not the sole source of correlation between the data. This finding is consistent with predictions made using the ISW effect, where one would expect weak correlations over the entire sky. In a flat universe the detection of the ISW effect provides direct and independent evidence for dark energy. We use our detection to constrain dark energy parameters by deriving a theoretical prediction for the directional wavelet covariance statistic for a given cosmological model. Comparing these predictions with the data we place constraints on the equation-of-state parameter w and the vacuum energy density ΩΛ. We also consider the case of a pure cosmological constant, that is, w=−1. For this case we rule out a zero cosmological constant at greater than the 99.9 per cent significance level. All parameter estimates that we obtain are consistent with the standard cosmological concordance model values. Although wavelets perform very well when attempting to detect the ISW effect since one may probe only the regions where the signal is present, once all information is incorporated when computing parameter estimates, the performance of the wavelet analysis is comparable to other methods, as expected for a linear approach.JDM would like to thank all at Universidad de Cantabria and Collège de France for the warm hospitality he received throughout his visit to each. JDM also thanks the Association of Commonwealth Universities and the Cambridge Commonwealth Trust for the support of a Commonwealth (Cambridge) Scholarship, King's College Cambridge for a Ferris Travel Grant and the Cambridge Philosophical Society for a travel grant. PV and EM-G acknowledge financial support from the Spanish MEC project ESP2004-07067-C03-01.Peer reviewedOxford University PressUniversidad de CantabriaAssociation of Commonwealth UniversitiesCambridge Commonwealth TrustMinisterio de Educación y Ciencia (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252007info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/386148reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1111/j.1365-2966.2007.11505.xSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3861482026-05-22T06:33:51Z
dc.title.none.fl_str_mv Detection of the integrated Sachs-Wolfe effect and corresponding dark energy constraints made with directional spherical wavelets
title Detection of the integrated Sachs-Wolfe effect and corresponding dark energy constraints made with directional spherical wavelets
spellingShingle Detection of the integrated Sachs-Wolfe effect and corresponding dark energy constraints made with directional spherical wavelets
McEwen, J. D.
Methods: data analysis
Cosmic microwave background
Cosmology: observations
Methods: numerical
title_short Detection of the integrated Sachs-Wolfe effect and corresponding dark energy constraints made with directional spherical wavelets
title_full Detection of the integrated Sachs-Wolfe effect and corresponding dark energy constraints made with directional spherical wavelets
title_fullStr Detection of the integrated Sachs-Wolfe effect and corresponding dark energy constraints made with directional spherical wavelets
title_full_unstemmed Detection of the integrated Sachs-Wolfe effect and corresponding dark energy constraints made with directional spherical wavelets
title_sort Detection of the integrated Sachs-Wolfe effect and corresponding dark energy constraints made with directional spherical wavelets
dc.creator.none.fl_str_mv McEwen, J. D.
Vielva, Patricio
Hobson, M. P.
Martínez-González, Enrique
Lasenby, Anthony N.
author McEwen, J. D.
author_facet McEwen, J. D.
Vielva, Patricio
Hobson, M. P.
Martínez-González, Enrique
Lasenby, Anthony N.
author_role author
author2 Vielva, Patricio
Hobson, M. P.
Martínez-González, Enrique
Lasenby, Anthony N.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidad de Cantabria
Association of Commonwealth Universities
Cambridge Commonwealth Trust
Ministerio de Educación y Ciencia (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Methods: data analysis
Cosmic microwave background
Cosmology: observations
Methods: numerical
topic Methods: data analysis
Cosmic microwave background
Cosmology: observations
Methods: numerical
description Using a directional spherical wavelet analysis we detect the integrated Sachs-Wolfe (ISW) effect, indicated by a positive correlation between the first-year Wilkinson Microwave Anisotropy Probe (WMAP) and NRAO VLA Sky Survey (NVSS) data. Detections are made using both a directional extension of the spherical Mexican hat wavelet and the spherical butterfly wavelet. We examine the possibility of foreground contamination and systematics in the WMAP data and conclude that these factors are not responsible for the signal that we detect. The wavelet analysis inherently enables us to localize on the sky those regions that contribute most strongly to the correlation. On removing these localized regions the correlation that we detect is reduced in significance, as expected, but it is not eliminated, suggesting that these regions are not the sole source of correlation between the data. This finding is consistent with predictions made using the ISW effect, where one would expect weak correlations over the entire sky. In a flat universe the detection of the ISW effect provides direct and independent evidence for dark energy. We use our detection to constrain dark energy parameters by deriving a theoretical prediction for the directional wavelet covariance statistic for a given cosmological model. Comparing these predictions with the data we place constraints on the equation-of-state parameter w and the vacuum energy density ΩΛ. We also consider the case of a pure cosmological constant, that is, w=−1. For this case we rule out a zero cosmological constant at greater than the 99.9 per cent significance level. All parameter estimates that we obtain are consistent with the standard cosmological concordance model values. Although wavelets perform very well when attempting to detect the ISW effect since one may probe only the regions where the signal is present, once all information is incorporated when computing parameter estimates, the performance of the wavelet analysis is comparable to other methods, as expected for a linear approach.
publishDate 2007
dc.date.none.fl_str_mv 2007
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/386148
url http://hdl.handle.net/10261/386148
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1111/j.1365-2966.2007.11505.x
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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